The rubber bands and some leather bands are provided with an adjustable three-fold clasp (Pointed tip diving type) of the type where the pointed tip of the band dives downward as shown in the figure.
If the clasp of the watch you purchased is as follows, please refer to the following instructions.
How to wear or take off the watch
Open the clasp and pull upward by pressing the push buttons on both sides of the buckle.
Fasten the clasp by pressing the frame of the buckle.
How to adjust the length of the band
Open the band clasp by pushing the buttons on both sides of the clasp.
Pull the pins out of the adjustment holes at both locations.
Slide the band to the right and left and at an appropriate length, push the pins firmly into the adjustment holes again at those 2 locations.
The above illustrations are provided as examples. Some details may differ depending on the model.